SMSI means Standard Manned Space Flight Initiator
see NSI-I in
NASA
Similar to SMSI
A&PS - Administration and Program Support
MSFC Directorate
A&R - Automation and Robotics
A&RC - Application and Resource Control
A&TA - Assembly and Test Area
A&V - Assembly and Verification
A/A - Air to Air
A/C - Aircraft
View all in NASA